#include <stdio.h>

int main(int argc, char**argvv)
{
    int a = 50;
    int b = 20;

    int* p = &a;
    int** p2 = &p;
    int*** p3 = &p2;

    *p2 = &b;
    **p2= 30;

    printf("%i", b);
    
        
    return 0;
}